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The main features of this disease are phenotypic heterogeneity and genetic heterogeneity. In this study, we examined four generations of a Chinese Mongolian with different phenotypes of syndactylia and analysed and identified the pathogenic genetic variants of SD by exon sequencing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The clinical phenotypes of patients were analysed, and the hands and feet were examined by X-ray. The pedigree was drawn, and the family data were analysed. Peripheral blood was collected from the family members, and genomic DNA was extracted. The candidate genes of SD were identified by exon sequencing, and the mutation sites of the captured candidate genes were amplified by PCR and verified by Sanger sequencing.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The family has congenital syndactyly, which is an autosomal dominant disease. At present, this condition has been passed down for 4 generations and was identified in 9 patients, including 4 males and 5 females. Five patients, I<jats:sub>2<\/jats:sub>, II<jats:sub>4<\/jats:sub>, III<jats:sub>5<\/jats:sub>, III<jats:sub>,7<\/jats:sub>and III<jats:sub>10<\/jats:sub>, had unilateral syndactyly, and four patients, III<jats:sub>16<\/jats:sub>, IV<jats:sub>3<\/jats:sub>, IV<jats:sub>6<\/jats:sub>and IV<jats:sub>7<\/jats:sub>, had bilateral finger syndactyly. All of their toes were unaffected. The proband and the other patients in this family had a c.917G\u2009&gt;\u2009A (p.R306Q) mutation, which is located at position 917 of the second exon of the<jats:italic>HOXD13<\/jats:italic>gene. This mutation results in a change in the amino acid at position 306, in which arginine is changed to glutamine. This mutation cosegregates in unaffected individuals and affected patients in this family. Moreover, 201 Mongolian genome databases and a thousand human genome databases were referenced to further confirm that the pathogenic genetic variant that causes syndactyly in this family is found in<jats:italic>HOXD13<\/jats:italic>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>This study found that the mutation site of the pathogenic gene in this family was<jats:italic>HOXD13<\/jats:italic>, c.917G\u2009&gt;\u2009A (p.R306Q). The phenotype of the family member III<jats:sub>12<\/jats:sub>was normal, but this member was also a carrier of the pathogenic genetic variant. This indicates that the disease of this family has incomplete penetrance characteristics. Our results further enrich the expression profile of the<jats:italic>HOXD13<\/jats:italic>gene.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12920-022-01360-3","type":"journal-article","created":{"date-parts":[[2022,10,4]],"date-time":"2022-10-04T14:09:35Z","timestamp":1664892575000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Identification of a HOXD13 variant in a Mongolian family with incomplete penetrance syndactyly by exon sequencing"],"prefix":"10.1186","volume":"15","author":[{"given":"Husile","family":"Husile","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhifeng","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liqing","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yaning","family":"Cao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qizhu","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,10,4]]},"reference":[{"key":"1360_CR1","doi-asserted-by":"crossref","unstructured":"Chouairi F, Mercier MR, Persing JS, et al. 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All research participants or their legal representatives signed informed consent forms for participation in clinical and genetic research, including the informed consent to publish clinical details and clinical images. Confirm that all methods were carried out in accordance with relevant guidelines and regulations.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"The authors declare that they have no competing interests.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}},{"value":"Not applicable.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}}],"article-number":"210"}}